Nature red in tooth and.....shell?

So, part of my job "requirement" is to be up on the news, in case patrons talk to us. They don't, much, other than to bitch. But, things happen. So, I saw this headline in The Atlantic: Walk for your lives! Deadly giant snails are invading Texas!  I was intrigued, of course.

Before I clicked on the article, I also (of course) immediately had expectations. Perhaps you've read the delightfully chilling short story by Patricia Highsmith (yes, of Strangers on a Train and The Talented Mr. Ripley fame)? "The Quest for Blank Claveringi"? I think I first read it in an Alfred Hitchcock short story collection in 6th or 7th grade. I honestly thought you could read it online, but am having a hard time locating it.

 (Giant African Snail, from Wikimedia Commons)